The effect of aeration on the composting of tree prunings chips
2000
Yoshimura, M. (Tokyo Univ. of Agriculture (Japan)) | Tajima, K. | Maki, T.
The disposal of the prunings is a difficult problem especially in municipal areas in Japan. Typically the prunings are decomposed, however the process takes around six months until it is done with several well-experienced skills, such as chipping branches, turning operation and adjusting of moisture content during the composting. In this study effects of the aeration during a composting with starter composts were examined to investigate an effective composting method. The fermenting process, the ending timing of composting, and effects of turning and aeration in composting period were observed in 1 cubic-meter detachable reactors equipped with air pipes. The condition of reactors were the no-aeration, the 5L/min. and the 10L/min. reactors. The turning intervals were 10-20 days and the moisture content was adjusted to 60% (w.b.). Duration of the composting examination was 105 days. Results of the examination were followings: 1) With 60 % of moisture content the composting process was completed in 90 days. 2) The aeration after the turning was effective to rise the temperature rapidly. The temperature reached to the suitable range for fermentation within 2 to 3 days with both aeration conditions. 3) The aeration reduced moisture content of the chips. Therefore the additional water must have been added to the chips at the turning operations. 4) The total additional water was 112L in 1 cubic-meter of tree chips. 5) The higher in aeration required higher amount of additional water. In conclusion, the aeration with turning operation was effective to reduce the time and to simplify the processes
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